package CodeDuiXiang;

public class Area {
	double chang;
	double gao;
	double di;
	double banJin;
	
	public double sanJiaoArea(){
		return di * gao / 2;
	}
	
	public double zhenFangXinArea(){
		return chang * chang;
	}
	
	public double yuanArea(){
		return 3.14 * banJin * banJin;
	}
}
